#define Rx 17
#define Tx 16

int buttonState = 0;
void setup() {
  Serial.begin(9600);
  Serial2.begin(9600);
  delay(500);
  pinMode(9, OUTPUT); //Yellow Send
  pinMode(8, OUTPUT); //Green Receive
  pinMode(3, INPUT); //Push button
  digitalWrite(8, LOW);
  digitalWrite(9, LOW);
}
void loop() {
  buttonState = digitalRead(3); //pushbutton state based on that state on pin 3

  if (buttonState == HIGH) {
    char outgoing = '2';
    Serial2.println(outgoing); //sending signal to other bots via the sentry bot
    digitalWrite(9, HIGH); //turning on yellow (sending) light
    delay(50);
  }
  else {
    digitalWrite(9, LOW);
  }

  if (Serial2.available()) {
    char incoming = Serial2.read();
    Serial.println(incoming); //incoming signal from a different bot via the sentry bot
    digitalWrite(8, HIGH); //turning on green (receiving) light
    delay(100);
  }
  else {
    digitalWrite(8, LOW);
  }
}